Improvement in hot-air furnaces



Lnr'ms.,

HOT-AIR FURNACE.

No. 172,890. .Patented Feb. 1, `187e.

l I c f-- fi-1wY L v I )I i Z l! i i Vl Lc- I -j lf e M UNITED STATESy PATENT Ormea; v

JOHN F. PEASE, OF SYRACUS, NEW YORK.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 172,890, dated February 1, 1876; application filed v January 4, 1876.

To' all whom it may concern:

Be it known that I, JOHN F. PEASE, of'Syracuse, in the county of Onondaga, in the StateA of New York, have invented a new and useful Improvement in Hot-Air Furnaces, of which the fol1owing,`taken in connection with the accompanying drawing, is a full, clear, and exact description.

The object of this invention is to consume in the combustion-chamber the gases which ascend in the magazine or coal-reservoir; also, to prevent the ash-dust, which, in shaking the grate, enters the ash box, from escaping through the ash-box door, without danger ot' causing accumulation of same inthe exit-flue; and it consists, lirst, in the combination, with the magazine or coal-reservoir and combustionchamber, of an exterior pipe, extended from the top ofthe magazine to thecombustion-cham. ber, constructed as hereinafter described, for the purpose of allowing the gases which ascend in the magazine to be drawn into the combustion-chamber; second, in extending a pipe from the ash-box to the combustion-chamber, and providing itv with a suitable damper, for the purpose of causing the ash-dust,which in shaking the grate enterstheash-box, to be drawn into the combustion-chamber, and to settle therein, and thus, in a great measure, prevent their entering the exit-fine, all .con-

structed and combined as hereinafter fully described.

The accompanying drawing fully illustrates my invention. A is the magazine or coal-reservoir, cast with a hemispherical top, which extends above the furnace. In the top thereof is made an orifice with screw-threads around its periphery, and into this is screwed either an elbow or T joint, b, of a pipe, soas to make an airtight joint. In cases where the magazine does not extend above the furnace, an extra piece of pipe is employed between the top ofthe magazine and the elbow, to bring the latter a proper height above the furnace. Into the horizontal portion of the elbow -joint b is screwed the horizontal pipe a, which is ex-4 tended to the front of the furnace and there connected with the verticalpipe d by the elbow-joint c. The pipe d extends down on the outside of the furnace to a point nearly or with external screw-threads, onto which is screwed the elbow-joint e. tal portion of the latter is screwed the horizontal pipe f, and the freer 'end Vof this is in'- combustion-chamber B, at or near the bottom thereof, thus completing the communication from the top of the magazine to the combustion-chamber by an apparatus which is easily attached to most magazine-furnaces.

Ordinarily this apparatus answers the purwhen combined with a pipe, a, extended from the top of `the magazine to the exit-line, as represented i`n the drawing, the valve o in the pipe n isprovided with the rod m, which is extended to the front of the furnace, and has a ratchetbottom edge thereat, engaging the top of the feed-door frame '0, and the valve u is attached to the vertical pipe d where most convenient for access. These valves are attached for the purpose of preventing the fire from being drawn into the apparatus, and cause explosions of gas when the feed-door of the magazine is opened, in which case the valve o is opened and the valve u closed. Ordinarily the valve o is closed and the valve a opened, to allow the gas to be drawn from the magazine to the combustionchamber.

p is a pipe, extended from the back of the ash-pit to the combustion-chamber B, and provided with the valve or damper r, which is operated by the rod s extended to the front of the furnace. By opening the valve r a draft is created through the pipe p, which checks the draft through the lire-pot, and also carries off the ne ashesv or dust which enters the ash-pit when the grate is shaken. Where the valve fr is closed the ordinary operation of the furnace remains unchanged.

l am aware that pipes similar to my apparatus have been applied to stoves having heating drums or chambers above the lire-box, and arranged to cause the products of combustion to take a circuitous route to the exitflue, tor the purpose of more effectually retaining'the heat; but such construction and combination ot'parts are not applicable to a magazine hot-air furnace, and have no reference to quite opposite the bottom of the combustion; chamber B, and is provided on its end thereat Into the `horizons'ertedy through anoriiice in the side'of` the pose of the first part of my invention; but

my invention, 'and I therefore do not claim such; neither (lo I claim a pipe extended from the ash-box to the exit-due, as I am aware the same is not new 5 nor does it accomplish the object sought in my invention.

What I do claimvas new, and desire to sel cure by Letters Patent, is-

1. Thecombination, with the magazine or coal-reservoir A and combustion=chamber B, the herein-described apparatus consisting' of the elbow 0r T joint b of a pipe attached with or without a vertical extension to the top of the magazine A, the horizontal pipe a, elbowjoint c, vertical pipe d, elbow-joint e, and horizontal pipe f, intersecting the combustionchamber B at or near the bottom thereof, cons'tructed and arranged substantially in the manner described and shown, for the purpose specied.

2. The combination of the gas-escape pipe n,having valve o, operated by rod m, which has at its outer end a ratchet bottom edge enlname and afxed my seal in the presence "of two attesting witnesses, at Syracuse, in the county of Onondaga and State of New York, this 31st day of December, 1875.

. JOHN F. PEASE. [L. s.] Witnesses:

DAvlD P. PLAISTED,

C. HOLMSTRUP. 

